11721423 has 32 divisors (see below), whose sum is σ = 19468800. Its totient is φ = 6120576.

The previous prime is 11721419. The next prime is 11721431. The reversal of 11721423 is 32412711.

It is not a de Polignac number, because 11721423 - 2² = 11721419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 11721423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11065 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (608400).

Almost surely, 2^11721423 is an apocalyptic number.

11721423 is a deficient number, since it is larger than the sum of its proper divisors (7747377).

11721423 is a wasteful number, since it uses less digits than its factorization.

11721423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071.

The product of its digits is 336, while the sum is 21.

The square root of 11721423 is about 3423.6563787857. The cubic root of 11721423 is about 227.1573427052.

The spelling of 11721423 in words is "eleven million, seven hundred twenty-one thousand, four hundred twenty-three".